check minimum openfl/lime versions

[Geokureli]

We need to throw errors when dev's lime and openfl versions are below the minimum allowed version, and add CI jobs that check those minimum versions with all new changes. When the minimum versions need to be raised, we need to broadcast this better, and we need to remove old unused code that only applies to old version, like when we check #if openfl_legacy and stuff

Related to #2962